Poration oe ontario



A. ufwELKER. y SOUND REPRODUCER. APPLICATION FILED FEB'. l. I9l9.

Patented Dec. 2,1919.

NVENTOR.

narran ramener ernten.

ALEXANDER H. VIEIKER, OF KITCHENER, ONTARIG, CANADA, ASSIGNOR TO POLLOCK MANUFACTURING COMPANY, LIMITED, OF KITCHENER, ONTARIO, CANADA, A COR- PORATION 0F ONTARIO.

SQUND-REFRODUCER.

Specification of Letters Patent.

Patented Dec. 2, 1919.

Y Application led February 1,'1919. Serial No. 274,559.

1 o all whom t may concern:

Be it known that I, rrmnmnnnn H. TEL- Kne, a subject of the King' of `Great Britain, residing' at Kitchener, in the county of Vaterloo, Province of Ontario, Canada, have invented certain new and useful Improvements in Sound-Reproducers, of which the following is-a specification.

My invention relates to improvements in sound reproducers and particularly to the pivotal bearing fer the lever or connection by which the reproducing needle is connected to the diaphragm of the sound-box. In some forms of reproducer, the casing of the sound-box is provided with pointed pins or thrust members, the ends of which engage in conical recesses formed in bearing members secured to opposite sides of the lever by which the movement of the reproducing needle is transmitted to the diaphragm. There is sometimes a tendency to bind between the coasting members of such a bearing because of changes in temperature or for other reasons, because of which freedom of movement of the parts is impeded and the reproduction of the record being tracked will accordingly not be as lood My invention overcomes this difficulty by providing sufhcient resiliency between the coacting members of a bearing` of the character referred to, to prevent binding' of the parts under temperature variations or the like, once the parts have been properly adjusted. This is accomplished in the preferred form of my invention by forming one of the bearinp; members of a suitable sufliciently resilient metal,l which is provided with an opening' therethrough at right angles to the axis of the thrust member which engages the same. The bearing is split or cut from this central openingv to the outer surface adjacent to the thrust member and the recess in which the thrust member is seated is situated with its axis in the plane of separation thus formed. The result of this construction is that the bearing member engages the end portion of the thrust member with suiiicient friction but with a certain amount of resiliency so that binding between the thrust member'and its bearing will be prevented.V v

In order that a clearer understanding of my invention may be had, attention is hereby direc-ted. to the accompanying' drawings forming' part of this application and illustrating one ei'nbodiment of my invention.

in the drawings, Figure 1 represents a front elevation of a reproducer sound-box provided with my invention; Fig. 2 is an enla ged partial view of the same with certain parts shown in section; and Fipg. 3 is a vertical section taken on line 3-3 of Fig. 2.

Referring' to the drawings, the sound-box is provided with a casing' in which a diaphragm 2 is secured in any usual manner. A bracket 3 is secured to one edge of the sound-box casing, this bracket having outwardly extending` portions 4, 4, provided.

with screw-threaded openings through which the screw-threaded thrust pins 5 and 6 are screwed. rlhe lever 7 of usual construction is secured or connected in any usual manner to the diaphragm, as is indicated at 8. The opposite end of this lever has secured thereto a member 8 provided with a socket 9 in which the usual reproducing needle may be secured as by means of the crew 10.

rChe lever 7 has secured thereto or 'inte` `gral therewith a bearing member or members extending outwardly on opposite sides of the lever as is indicated at 11 and 12. One of these bearinrt),` members such as that illustrated at 11 may be provided at its outer end with a conical recess in which the pointed end portion 13 of the thrust screw 5 is adapted to seat. The other bearing member 12 is provided with an opening le extending` therethrough at right angles to the axis of the screw-threaded thrust member 6, this opening 14 being` sufficiently large to leave a comparatively thin wall between the same and the outer surfaces of the mem ber. The member 12 is split or cut, as is indicated at 15, from the central opening 14 to the surface 16 of the bearing member which is adjacent to the thrust member 6. The seating' recess for the member 6 extends through this outer-surface of member 12 in which the cut 15 has been formed with the axis of the recess in the plane of separation between the upper and lower portions of the outside surface 16 cf the bearing member.

Nhen the device is assembled, the thrust members 5 and 6 will be screwed into engagement with their seating recesses in the bearing` members 11 and 12, the thrust members being held in properly adgusted post tion by means of the nuts 17, 1,7. When vso adjusted, the pointed end 18 of the thrustI member 6 will extend somewhat into the central opening 140i' bearing member 12, ,and the portions of theibeering `member .engag` ing` against the surface of the end portion 18 of thrust member 6 will engagethe same resiliently, the member l2 being formed of suitable resilient metal, such es steel. `The resiliency o the metal will vbe,suliieient ito permit the seme to yield slightly' under tem pereture variations, which otherwise Ywould cause binding' between the thrust member and the bearing.

What I claim is l 1f. In :i sound reprodueer, the combination ef e sound-box `easing, a diaphreigm' therein, e lever connected et ,one end toseid diaphragm, `and edepfted to ,carry `L'reproducing; needle, end y@pivotal ,connection for seid lever, comprising ,thrust members and bearing; members ltherefor grrrenge'd 'onopposite sides yof 4seid lever, secured" to seid Casing' and lever, ,oneof seid-thrust members hay ing s [pfinted endendthe :bearing -member therefor rbeing, r split,fvwill @Qrtions'ton Loppe- Sf/ sids''f 1111@ Plane Q'f lslenelrfi eileiied to Vpress resiliently against the pointed end portion of seid thrust member.

` 2. In a sound reprodueer, the combination of a sound-bex oasing, e diaphragm therein, e lever Connected 'et one end to said diaphrsgm, and adapted to vearrry e reproducing needle, and e pivotal connection for seid lever, Comprising thrust members and bezir-V ing' .members therefor errenged on jopposite sides of seid lever, see1n'ed to seid casing and lever, one of'ssid thrust members having a pointed end and `the bearing member therefor being` .of resilient metil; with en opening therethrough et right angles to the exis of .seidthrust niemb'erysaid bearing member beingsplit through from seid ,opening lto the surfcesgidjeeentseid thrust ,in ember, end heyingus :recess to receive ,the end portion of said thrust member With its exis in the pinne 'of seperetion. Y Y Y This `specifi(:ation signed .end `witnessed ,this 9 da-y of J zuiuzrry,1919. Y'

ALEXANDER H. WELKER. Witnesses `,Russin Bisi-Inn, E. W. GLEMENT, 

